Hey there, I'm from Codecov and I just wanted to say, this point is really smart. I had never thought about the challenge of per-user pricing precisely this way.
Codecov was the first per-user service that I bought successfully. I like the feature that lets you pick who to apply your license to. In our case, our office manager manages the billing, but she doesn't need to view coverage reports. So that saves us like $12, which is appreciated :)